Enjoy clear, clean drinking and cooking water on the road in your RV! No more struggles with fittings, water buckets or dirty filters ? just twist off the old cartridge and twist on the new one with ?no leak? inlet & outlet check valves. NSF Certified to reduce lead, cysts, lindane, atrazine, volatile organic chemicals, mercury, chlorine, bad taste and odor. Includes filter head, disposable cartridge, winterization by pass fitting, water supply adapter, mounting screws/hardware, ?" plastic tubing and instructions. Cartridge lasts 6 months or 500 gals. 1/box.